<?php

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *	   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @package log4php
 */

/**
 * This is a very simple filter based on level matching.
 *
 * <p>The filter admits two options <b><var>LevelToMatch</var></b> and
 * <b><var>AcceptOnMatch</var></b>. If there is an exact match between the value
 * of the <b><var>LevelToMatch</var></b> option and the level of the
 * {@link LoggerLoggingEvent}, then the {@link decide()} method returns
 * {@link LoggerFilter::ACCEPT} in case the <b><var>AcceptOnMatch</var></b>
 * option value is set to <i>true</i>, if it is <i>false</i> then
 * {@link LoggerFilter::DENY} is returned. If there is no match,
 * {@link LoggerFilter::NEUTRAL} is returned.</p>
 *
 * <p>
 * An example for this filter:
 *
 * {@example ../../examples/php/filter_levelmatch.php 19}
 *
 * <p>
 * The corresponding XML file:
 *
 * {@example ../../examples/resources/filter_levelmatch.xml 18}
 *
 * @version $Revision: 1213283 $
 * @package log4php
 * @subpackage filters
 * @since 0.6
 */
class LoggerFilterLevelMatch extends LoggerFilter
{

    /**
     * Indicates if this event should be accepted or denied on match
     *
     * @var boolean
     */
    protected $acceptOnMatch = true;

    /**
     * The level, when to match
     *
     * @var LoggerLevel
     */
    protected $levelToMatch;

    /**
     *
     * @param boolean $acceptOnMatch            
     */
    public function setAcceptOnMatch($acceptOnMatch)
    {
        $this->setBoolean('acceptOnMatch', $acceptOnMatch);
    }

    /**
     *
     * @param string $l
     *            the level to match
     */
    public function setLevelToMatch($level)
    {
        $this->setLevel('levelToMatch', $level);
    }

    /**
     * Return the decision of this filter.
     *
     * Returns {@link LoggerFilter::NEUTRAL} if the
     * <b><var>LevelToMatch</var></b>
     * option is not set or if there is not match.	Otherwise, if there is a
     * match, then the returned decision is {@link LoggerFilter::ACCEPT} if the
     * <b><var>AcceptOnMatch</var></b> property is set to <i>true</i>. The
     * returned decision is {@link LoggerFilter::DENY} if the
     * <b><var>AcceptOnMatch</var></b> property is set to <i>false</i>.
     *
     * @param LoggerLoggingEvent $event            
     * @return integer
     */
    public function decide(LoggerLoggingEvent $event)
    {
        if ($this->levelToMatch === null) {
            return LoggerFilter::NEUTRAL;
        }
        
        if ($this->levelToMatch->equals($event->getLevel())) {
            return $this->acceptOnMatch ? LoggerFilter::ACCEPT : LoggerFilter::DENY;
        } else {
            return LoggerFilter::NEUTRAL;
        }
    }
}
